Without video: https://en.wikipedia.org/wiki/Abel%E2%80%93Ruffini_theorem
I'm struggling to understand the negative tone in your reply to the parent comment. They simply offered an additional resource on the topic. Rather than welcoming it, you seem to have taken issue with it. One of the strengths of HN threads is that people often contribute further material that others may find helpful.
The video is useful but so is the Wiki article. Some readers will prefer the video, some the article, and some both. Why object to someone sharing another link?
I (correctly) interpreted the terse, dismissive tone of their comment, which implied that the video added no value beyond what was found in the Wikipedia page. Other comments here confirm that I'm not the only one who read it that way. The clear subtext was "don't waste your time with that slop, just read this." I was certain that, if that was their takeaway, then they hadn't even bothered to watch the video (which turned out to be correct). But I only knew that because I had already watched the video the previous day and was deeply impressed by it.
At the time I replied, it was the only comment here, and was therefore setting the tone of the discussion. I didn't want all the people who only follow the link after checking the comments to assume that the video was just a lazy Wikipedia summary, upvote the comment for "saving them time", and then move on. My primary goal was to actually describe the video and encourage anyone out there who likes this sort of thing to give it a shot. In order to do that effectively, I felt I also had to push back on the impression left by the comment I replied to.
This is good to know, for this video. Unfortunately, HN doesn't have a way to indicate this other than linking to a YouTube video; and in my experience very few YouTube videos are a superior way to absorb information than reading. To find that out, I'd have to either watch the video (negative expected value), or wait for a comment from someone like you -- and now that the latter has happened, perhaps I'll actually try to watch it. In the meantime, I do think there's value in providing information without a (sometimes literal) song and dance around it for those interested in learning over entertainment, on average.